An Etymological Dictionary of the German Language/Annotated/Schacht

Schacht (1.), masculine, ‘shaft’ (of a pit), from the equivalent Middle High German schaht, masculine; properly the Low German form of Schaft. See the following word.

Schacht (2.), masculine, ‘square rood,’ Modern High German only, from the equivalent Low German schacht, which is identical with High German Schaft. —